CN101908157A - NFC-SIM (Near Field Communication-Subscriber Identity Module) chip - Google Patents
NFC-SIM (Near Field Communication-Subscriber Identity Module) chip Download PDFInfo
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- CN101908157A CN101908157A CN2009100573727A CN200910057372A CN101908157A CN 101908157 A CN101908157 A CN 101908157A CN 2009100573727 A CN2009100573727 A CN 2009100573727A CN 200910057372 A CN200910057372 A CN 200910057372A CN 101908157 A CN101908157 A CN 101908157A
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Abstract
The invention discloses an NFC-SIM (Near Field Communication-Subscriber Identity Module) chip. After reset signals on a resetting pin are processed by a reset signal generating module, serial port reset signals of an SCI7816 serial port module are directly generated, an SWP (Single Wire Protocol) interface module transmits SWP resetting request signals to the reset signal generating module when an SWP state mark obtained by using the SWP interface module for analyzing S1 signals on an SWP interface pin is changed to DEACTIVATED from SUSPENDED, and then SWP reset signals of the SWP interface module are directly generated after the SWP resetting request signals are processed by the reset signal generating module, thereby the resetting of the two modules is completely isolated. The NFC-SIM chip can also greatly reduce the power consumption of SWP in NFC application and really achieve the purpose of sleeping at any time and awaking in time.
Description
Technical field
The invention belongs to the chip design field, particularly a kind of NFC-SIM chip.
Background technology
NFC (Near Field Communication, near-field communication) is a kind of wireless connect technology, with existing contactless smart card technical compatibility, has become the official standard that more and more leading firms support at present.NFC is still a kind of closely connection protocol simultaneously, provides between various device easily, safety, communication rapidly and automatically.Compare with the connected mode in the wireless world, NFC is a kind of in-plant secret communication mode, and it combines non-contact inductive and wireless connect technology, acts on the 13.56MHz frequency band, transmission range only is about 10 centimeters, and transmission speed is second 106kbit/ second~424kbit/ at present.It not only meets ISO 18092, ISO 21481, ECMA (340,352 and 356) and ETSI TS 102 190 standards, but also with the contactless smart card infrastructure device compatibility that adopts ISO 14443 A, the widespread use of B standard, therefore becoming in recent years, mobile phone provides mobile payment, service to receive the best solution of service.Compare with other short-distance wireless communication technology, NFC is safer, and the reaction time is shorter, therefore is suitable as very much the stored value card technology under the wireless transmission environment, the quick and tool security of transaction.
The NFC-SIM chip is a kind of intelligent card chip, but the function of simple realization SIM (smart card) not only, also be applied to present extensive concern and popular near-field communication (NFC, Near FieldCommunication) in the middle of, mainly is active in fields such as various mobile small amount payments and mobile phone admission ticket, identification.
SWP (Single Wire Protocol, ETSI TS 102 613) full name single-wire-protocol, it is the interface protocol that is used for connecting CLF (Contactless Front-end, non-contact front-end chip) chip and the use of NFC-SIM (near-field communication smart card) chip during NFC uses.SWP realizes full duplex communication on a single line, defined the signal of S1 and S2 both direction, CLF and NFC-SIM chip are by the interconnection of SWP interface pin, voltage signal is S1 on it, current signal is S2, thereby the S1 voltage signal that the NFC-SIM chip sends by parsing CLF is resolved and is obtained the data that the other side sends, the NFC-SIM chip is by regulating size of current (being the S2 signal) simultaneously, send signal to CLF, so just realized realizing the data transmission of full duplex, as shown in Figure 1 with a single line.The NFC-SIM chip is by resolving the S1 signal at inside generation SWP_state (SWP Status Flag).SWP is the solution that has future prospect during present NFC uses most.Be widely accepted in fields such as mobile phone admission ticket and small amount payments and adopt.
Common NFC-SIM chip, integrated SWP interface, pin one has 8, pinout meets the integrated circuit card standard of ISO7816 contact-carrying, as shown in Figure 2, wherein C1 is operating voltage pin VCC, C2 is reset pin RST, C3 is clock pin CLK, C5 is ground pin GND, C7 is an input and output pin, SCI7816 serial communication interface normally, C4, C8 has been expanded to the high-speed interface of SIM card of new generation by International Standards Organization, C6 is as the SWP interface pin, utilize this pin to realize the SWP interface protocol at the NFC-SIM chip, thus with the CLF chip communication interaction data in the external world.The communication interface of tradition SIM card chip is SCI7816, this interface is the data communication that is used for connecting between SIM card and the mobile phone etc., not only need to guarantee the operate as normal of SWP interface later on having increased the SWP interface, the more important thing is that will consider how to allow SWP and two data interfaces of SCI7816 work alone does not disturb mutually.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of NFC-SIM chip, can realize that two data interfaces of SWP and SCI7816 work alone not disturb mutually.
For solving the problems of the technologies described above, NFC-SIM chip of the present invention, comprise system control module, the SWP interface module, the SCI7816 serial interface module, pinout meets the integrated circuit card standard of ISO7816 contact-carrying, has the operating voltage pin, reset pin, the clock pin, the ground pin, the SWP interface pin, input and output pin and two high-speed interface pins be totally eight pins, the SCI7816 serial interface module connects input and output pin, the SWP interface module connects the SWP interface pin, the NFC-SIM chip utilizes the SWP interface pin to realize the SWP interface protocol, with the CLF chip communication interaction data in the external world, SWP state SUSPENDED (idle condition) or DEACTIVATED (inactive state) that the SWP interface module obtains the S1 signal resolution on the SWP interface pin; It is characterized in that, also comprise the reset signal generation module, after the NFC-SIM chip operate as normal, if reset pin sends reset signal to the NFC-SIM chip, the reset signal generation module only sends the serial ports reset signal to the SCI7816 serial interface module so, and do not send the SWP reset signal to the SWP interface module, the SCI7816 serial interface module only resets this moment, and the SWP interface module that directly do not reset, when the SWP state that the S1 signal resolution on the SWP interface pin is obtained when the SWP interface module becomes DEACTIVATED by SUSPENDED, the SWP reseting request signal that the SWP interface module is sent to the reset signal generation module, the reset signal generation module only sends the SWP reset signal to the SWP interface module after receiving the SWP reseting request signal, and do not send the serial ports reset signal to the SCI7816 serial interface module, this moment the SWP interface module that only resets, and the SCI7816 serial interface module that directly do not reset.
Described NFC-SIM chip, comprise that also wake-up signal produces circuit, after described SWP interface module resets and finishes, if the SWP interface module still is DEACTIVATED to the SWP state that the S1 signal resolution on the SWP interface pin obtains, the clock of SWP interface module is turned off in described system control module control, when the SWP state that the S1 signal resolution on the SWP interface pin is obtained when the SWP interface module is DEACTIVATED, if occur drawing level with the S1 signal on the continuous SWP interface pin of CLF chip, then wake-up signal produces circuit and produces wake-up signal, the clock of the open SWP interface module of system control module control.
NFC-SIM chip of the present invention, after the processing of reset signal RSTN above the reset pin C2 through the reset signal generation module, directly produce the serial ports reset signal SCI7816 of SCI7816 serial interface module, when the SWP state that the S1 signal resolution on the SWP interface pin is obtained when the SWP interface module becomes DEACTIVATED by SUSPENDED, the SWP interface module sends the SWP reseting request signal to the reset signal generation module, after the processing through the reset signal generation module, directly produce the SWP reset signal rstn_swp of SWP interface module, accomplish that resetting of two modules keep apart fully, can realize that two data interfaces of SWP and SCI7816 work alone not disturb mutually.NFC-SIM chip of the present invention can also reduce the power consumption penalty of SWP in the NFC application greatly, and can also accomplish that really dormancy in time wakes up at any time.
Description of drawings
Below in conjunction with the drawings and the specific embodiments the present invention is described in further detail.
Fig. 1 is a SWP single-wire-protocol synoptic diagram;
Fig. 2 is a SIM chip pin synoptic diagram;
Fig. 3 is NFC-SIM chip one an embodiment synoptic diagram of the present invention;
Fig. 4 is that NFC-SIM chip one embodiment SWP interface module of the present invention is waken the waveform synoptic diagram up;
Fig. 5 is the schematic flow sheet that wakes up of NFC-SIM chip one embodiment SWP interface module of the present invention.
Embodiment
NFC-SIM chip one embodiment of the present invention as shown in Figure 3, comprise system control module, the SWP interface module, the SCI7816 serial interface module, the reset signal generation module, wake-up signal produces circuit, have 8 pins, pinout meets the integrated circuit card standard of ISO7816 contact-carrying, wherein C1 is operating voltage pin VCC, C2 is reset pin RST, C3 is clock pin CLK, C5 is ground pin GND, C7 is a SCI7816 serial interface module input and output pin, C4, C8 is a high-speed interface, C6 is as the SWP interface pin, the NFC-SIM chip utilizes this pin to realize the SWP interface protocol, thus with the CLF chip communication interaction data in the external world.Described NFC-SIM chip, after operating voltage pin C1 adds work voltage VCC, the chip power POR (Power On Reset) that resets, the entire chip that resets comprises SWP interface module and SCI7816 serial interface module.After the chip operate as normal, Reset takes place if reset pin C2 goes up, be that reset pin C2 sends reset signal to the NFC-SIM chip, the reset signal generation module only sends serial ports reset signal rstn_sci7816 to the SCI7816 serial interface module so, and do not send SWP reset signal rstn_swp to the SWP interface module, only allow the SCI7816 serial interface module that resets this moment, and do not allow directly to reset chip and SWP interface.Meet SWP state SUSPENDED (idle condition) or DEACTIVATED (inactive state) that the SWP interface module of SWP interface pin obtains the S1 signal resolution on the SWP interface pin, when the SWP state that the S1 signal resolution on the SWP interface pin is obtained when the SWP interface module becomes DEACTIVATED (inactive state) by SUSPENDED (idle condition), the SWP interface module is sent SWP reseting request signal reset_request to the reset signal generation module, the reset signal generation module only sends SWP reset signal rstn_swp to the SWP interface module after receiving SWP reseting request signal reset_reques, and do not send serial ports reset signal rstn_sci7816 to the SCI7816 serial interface module, only allow the SWP interface module that resets this moment, and do not allow directly to reset chip and SCI7816 serial interface module.
After the described NFC-SIM chip operate as normal, the SWP state that the SWP interface module obtains the S1 signal resolution on the SWP interface pin is that DEACTIVATED the SWP interface module can take place resets, after the SWP interface module resets and finishes, if the SWP interface module still is DEACTIVATED to the SWP state that the S1 signal resolution on the SWP interface pin obtains, the NFC-SIM chip is in order to economize power consumption, system control module can be controlled the clock of SWP interface module is turned off, the SWP Status Flag DEACTIVATED that S1 signal resolution on the SWP interface pin is obtained when the SWP interface module, if occur drawing level with the S1 signal on the continuous SWP interface pin C6 of CLF chip, then wake-up signal produces circuit and produces wake-up signal, the clock of the open SWP interface module of system control module control, this moment, the SWP interface module was waken up, and wake-up signal produces circuit and produces wake-up signal NFC-SIM chip and can accept the data of coming from the SWP interface pin at once.The SWP interface module wake the waveform synoptic diagram up as shown in Figure 4, the SWP interface module wake schematic flow sheet up as shown in Figure 5, SWP state and S1 signal correction that the generation of wake-up signal and SWP interface module obtain the S1 signal resolution on the SWP interface pin.The SWP state that the SWP interface module obtains the S1 signal resolution on the SWP interface pin is DEACTIVATED, and the S1 level by low uprising the time wake-up signal produce circuit and produce wake-up signal at once.One SWP wake-up circuit implementation is, CK end with register connects the S1 signal that decoding is come out on the SWP interface pin, the SWP state that S1 signal resolution on the SWP interface pin is obtained with current SWP interface module is the D end of the condition of DEACTIVATED as aforementioned register, and the Q end output of aforementioned register is as wake-up signal.
By in the agreement of SWP as can be seen, have only the CLF chip just to have the right to allow the SWP interface module resolve the SWP state that obtains and enter the DEACTIVATED state, the theory that adopts in our the NFC-SIM chip design is to think that the CLF chip may accept the packet entanglement in this case, the SWP interface module of NFC-SIM chip need reset, because SWP interface module SWP state that the S1 signal resolution on the SWP interface pin is obtained only need enter the SUSPENDED state and gets final product generally speaking, need not to enter the DEACTIVATED state.In case therefore the SWP interface module is resolved the SWP state that obtains and is entered DEACTIVATED by SUSPENDED, the action of the SWP interface module that resets should take place at once, NFC-SIM chip of the present invention, the technical scheme that adopts is, reseting request signal of SWP interface module output is given the reset signal generation module, and the SWP reset signal of being exported the SWP interface module by the reset signal generation module again returns to the SWP interface module.
NFC-SIM chip of the present invention, after the processing of reset signal RSTN above the reset pin C2 through the reset signal generation module, directly produce the serial ports reset signal SCI7816 of SCI7816 serial interface module, when the SWP interface module becomes DEACTIVATED to the SWP state that the S1 signal resolution on the SWP interface pin obtains by SUSPENDED, the SWP interface module sends the SWP reseting request signal to the reset signal generation module, after the processing through the reset signal generation module, directly produce the SWP reset signal rstn_swp of SWP interface module, accomplish that resetting of two modules keep apart fully.
NFC-SIM chip of the present invention can reduce the power consumption penalty of SWP in the NFC application greatly, and can also accomplish that really dormancy in time wakes up at any time.
Claims (2)
1. NFC-SIM chip, comprise system control module, the SWP interface module, the SCI7816 serial interface module, pinout meets the integrated circuit card standard of ISO7816 contact-carrying, has the operating voltage pin, reset pin, the clock pin, the ground pin, the SWP interface pin, input and output pin and two high-speed interface pins be totally eight pins, the SCI7816 serial interface module connects input and output pin, the SWP interface module connects the SWP interface pin, the NFC-SIM chip utilizes the SWP interface pin to realize the SWP interface protocol, with the CLF chip communication interaction data in the external world, SWP state SUSPENDED or DEACTIVATED that the SWP interface module obtains the S1 signal resolution on the SWP interface pin; It is characterized in that, also comprise the reset signal generation module, after the NFC-SIM chip operate as normal, if reset pin sends reset signal to the NFC-SIM chip, the reset signal generation module only sends the serial ports reset signal to the SCI7816 serial interface module so, and do not send the SWP reset signal to the SWP interface module, the SCI7816 serial interface module only resets this moment, and the SWP interface module that directly do not reset, when the SWP state that the S1 signal resolution on the SWP interface pin is obtained when the SWP interface module becomes DEACTIVATED by SUSPENDED, the SWP reseting request signal that the SWP interface module is sent to the reset signal generation module, the reset signal generation module only sends the SWP reset signal to the SWP interface module after receiving the SWP reseting request signal, and do not send the serial ports reset signal to the SCI7816 serial interface module, this moment the SWP interface module that only resets, and the SCI7816 serial interface module that directly do not reset.
2. NFC-SIM chip according to claim 1, it is characterized in that, comprise that also wake-up signal produces circuit, after described SWP interface module resets and finishes, if the SWP interface module still is DEACTIVATED to the SWP state that the S1 signal resolution on the SWP interface pin obtains, the clock of SWP interface module is turned off in described system control module control, when the SWP state that the S1 signal resolution on the SWP interface pin is obtained when the SWP interface module is DEACTIVATED, if occur drawing level with the S1 signal on the continuous SWP interface pin of CLF chip, then wake-up signal produces circuit and produces wake-up signal, the clock of the open SWP interface module of system control module control.
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